rate, where everybody gets charged the same amount, just like a postage stamp. whether you send a letter to new jersey or virginia, it cost the same amount. levels of service at time of use are not differentiated. based upon our research, if you go to the bottom of that page, that is rarely ever used in power rate setting. you would imagine not a lot of proposals will be before you for that in late november and early december, nor before right fairness. however, in class differentiated, that is where we looked at residential demand verses commercial demand -- versus commercial demand, we can separate large businesses or so families or anything else. that is frequently used in water, waste water, and power setting.